Parse output of command and store in variables - bash

Question

I need to parse the output of the mmls command and store multiple values in variables using a BASH script.
Specifically, I need to store: sector size (512 in the example below), and start values (0,0,63,224910,240975 in the example below). Since the second set of values represent partitions, the number of values captured could vary.
mmls /mnt/E01Mnt/RAW/ewf1
DOS Partition Table
Offset Sector: 0
Units are in 512-byte sectors
Slot Start End Length Description
000: Meta 0000000000 0000000000 0000000001 Primary Table (#0)
001: ------- 0000000000 0000000062 0000000063 Unallocated
002: 000:000 0000000063 0000224909 0000224847 NTFS / exFAT (0x07)
003: 000:001 0000224910 0000240974 0000016065 DOS FAT12 (0x01)
004: ------- 0000240975 0000250878 0000009904 Unallocated

Answer 1

Here's a start:
$ awk '/^Units/{print $4+0} /^[0-9]/{print $3+0}' file
512
0
0
63
224910
240975
Try to solve the rest yourself and then let us know if you have questions.
Explanation: file is a file containing your sample input. You can replace awk '{script}' file with command | awk '{script}' if you're input is coming from the output of some command rather then being stored in a file.
^ is the universal regexp metacharacter for start of string while /.../ in awk means "find this regexp". So the above is looking for lines that start with the text shown (i.e. Units or digits) and then printing the 4th or 3rd space-separated field after adding zero to it to remove any trailing non-digits or leading zeros. man awk.

Answer 2

You need a bit of awk to start with.
values=( $(mmls /mnt/E01Mnt/RAW/ewf1 | awk '
/^Units are in/{match($4,/^[[:digit:]]+/,ss); print ss[0]}
NR>6{print $4}'
) )
Now you have a values array which contains both the sector size(first element) and the start values(subsequent elements) . We could do some array manipulation to separate individual elements.
secsize=${values[0]} # size of sector
declare -a sv # sv for start values
for((i=1;i<${#values[#]};i++))
do
sv+=( ${values[i]} )
done
echo "${sv[#]}" # print start values
unset values # You don't need values anymore.
Note: Requires GNU awk.